Unexpected timestamp format renders as "Invalid date"

The Message View widget will sometimes display "Invalid date" even though the date field has been indexed successfully - see the lower right of the image below, with the field `event_created`:


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The field can be used for search and aggregations. The value field does display properly when opening the message in a new tab:


## Expected Behavior
The date value of the message should be displayed.

## Current Behavior
The message view replaces the value with 'Invalid date'

## Possible Solution
The message view should recognize more formats and/or If it cannot be parsed in the message view it should show the original value.

## Steps to Reproduce (for bugs)

1. Install Illuminate and activate the Sonicwall Illuminate pack
2. Replay the following message: `'id=SDF2lk3rj sn=SD2342LJFS time="2022/04/22 10:33:13.123-0500" fw=10.1.3.2 pri=4 c=16 m=1635 msg="sample placeholder value"`
3. Expand the message in the message view window and review the `event_created` field

## Context

This may lead to some confusion about the underlying data in the affected fields.

## Your Environment

* Graylog Version: 5.0.6
* Java Version: 17.0.6
* Elasticsearch Version: Opensearch 1.3.6
* MongoDB Version: 5.0.14
* Operating System: Ubuntu 20.04.5 LTS
* Browser version: Firefox 111.0.1 64-bit